Photopolymerized superhydrophobic hybrid coating enabled by dual-purpose tetrapodal ZnO for liquid/liquid separation
Photopolymerized superhydrophobic hybrid coating enabled by dual-purpose tetrapodal ZnO for liquid/liquid separation
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由双用途四足氧化锌实现的光聚合超疏水杂化涂层，用于液/液分离
DOI：
10.1039/d1mh01672e
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发表时间：
2022
影响因子：
13.3
通讯作者：
Jiang, Zhiyuan
中科院分区：
文献类型：
--
作者：
Li, Chenxuan;Lee, Brian;Wang, Chenxu;Bajpayee, Aayushi;Douglas, Lacey D.;Phillips, Bailey K.;Yu, Guanghua;Rivera-Gonzalez, Natalia;Peng, Bo-ji;Jiang, Zhiyuan
低成本和可扩展的超疏水涂层方法为不混溶的液体/液体混合物的节能分离提供了可行的方法。开发了一种可扩展的光聚合方法，以功能化多孔基底与四足ZnO（T-ZnO）和聚甲基丙烯酸酯的混合涂层，其表现出同时的超疏水性和超亲油性。在这里，T-ZnO具有双重目的：（i）在制造过程中通过空穴介导的途径引发自由基光聚合，以及（ii）提供分级表面粗糙度以放大润湿性特性并将液滴悬浮在亚稳态Cassie-Baxter状态中。光聚合提供了精细控制所形成的聚合物的转化率和空间分布的手段，同时允许容易的大面积制造和在热敏基底上的潜在涂覆。具有所需超疏水/超亲油特性的涂覆不锈钢网和滤纸在分离分层油/水、油/离子液体和水/离子液体混合物以及油包水乳液方面表现出优异的性能。该混合涂层展示了它们在不混溶的液体/液体混合物的大规模节能分离中的长期应用所期望的机械鲁棒性和耐化学性。
Low-cost and scalable superhydrophobic coating methods provide viable approaches for energy-efficient separation of immiscible liquid/liquid mixtures. A scalable photopolymerization method is developed to functionalize porous substrates with a hybrid coating of tetrapodal ZnO (T-ZnO) and polymethacrylate, which exhibits simultaneous superhydrophobicity and superoleophilicity. Here, T-ZnO serves dual purposes by (i) initiating radical photopolymerization during the fabrication process through a hole-mediated pathway and (ii) providing a hierarchical surface roughness to amplify wettability characteristics and suspend liquid droplets in the metastable Cassie—Baxter regime. Photopolymerization provides a means to finely control the conversion and spatial distribution of the formed polymer, whilst allowing for facile large-area fabrication and potential coating on heat-sensitive substrates. Coated stainless-steel meshes and filter papers with desired superhydrophobic/superoleophilic properties exhibit excellent performance in separating stratified oil/water, oil/ionic-liquid, and water/ionic-liquid mixtures as well as water-in-oil emulsions. The hybrid coating demonstrates desired mechanical robustness and chemical resistance for their long-term application in large-scale energy-efficient separation of immiscible liquid/liquid mixtures.